Coal-gas burner



Nov. 16 1926. 1,607,312

F. H. SCHIERENBECK COAL GA-s BURNER Filed July 22. 1925 Patented Nov. 1.6, 1926.`

AUNITED STATES FREDERICK E. SCHIERENBECK, 0F MINNEAPOLIS, MINNESOTA. v

COAL-GAS BURNER.

'Application led .Tuly 22, 1925. Serial No. 45,242.

This invention relates to means for oxidizing, or mixing the carbon monoxide gases which arise from coal fires in furnaces, and the like, with preheated air under pressure, so as to form a proper and highly combus` tible mixture of dioxide gas, which, by burning in the furnace, will both increase the heating eiiciency of the coal or other fuel, and, by so doing, will also be carried oif without leaving the usual and objectional deposits of soot in the flues and draft chambers. More specifically the present invention is an improvement on the device shown `in my` co-pending application for Patent, Serial Number 752,148, filed on November 25, 1924 for means for oxidizing fuel gases for furnaces and the like.

As stated in the specification of the above mentioned application, it is a common and well known fact that non-combustible gases are very frequently generated by and over a bed of hot coals in any re box, and that these gases. are notv only very objectionable,

v butV are, under some conditions", dangerous,

and are usually lresponsible for the heavy deposits of soot which accumulate in the fiues and draft chambers. In order to overcome these objections and to utilize these otherwise non-combustible gases, and thus the full heating efficiency of the fuel, it is necessary to oxidize or oxygenate these gases, and preferably to charge the gases with oxygen of approximately the same temd perature as the gases, in order that a proper and complete fusion or blending of the gas and oxygen may result.

The mechanismlI'employ to accomplish the objects above noted will be more fully described and set forth lin the following,

, specification and claims, reference being had to'the accompanying drawing, in which:

Figure 1 is a horlzontal lsectional view of a common type of furnace in which my invention has been incorporated.

Figure 2 is a sectional elevation as seen substantially on the line 2 2 in Figurel. Figure 3 is a sectional elevation about as on the line 3-3 in Figure 2. A

Referrin to the drawing moreV particularly and y reference characters A 'designates the cylindrical wall of a furnace, having a fire door B, an ash pit door C, and a series of grate bars D, all of common and well kknown construction.

Arranged near and preferably at one side of the furnace, is a platform 4, upon which is mounted a centrifugal blower 5 driven by a motor 6. 'A discharge flue, or spout, 7 of the blower extends into the ash pit of the furnace, lmmediately below the grate D. Upon the grate D and preferably above the discharge end of the tube 7 is a hollow base member 8 having a supporting flange 9. A drum 10 is arranged adjacent to the wall of the furnace and has a reduced lower end, or neck, 11 which fits snugly over the base 8. The drum is rigidly held in posit-ion by any suitable means, such as a brace or bracket member 12, but the base 8 is vertically slidable inthe neck 11 so that the grate bars may be oscillated or .shaken, in the usual manner, yet the base 8\will always retain its proper operating position lwith respect to the drum neck 11. This drum comprises an air preheating chamber and has a relatively large convex front surface 13 which comes kin direct contact with the hot coals of the' furnace. The back, or outer, surface of the drum contacts with the wall of the furnace in such a manner as to be cooled thereby and to prevent this surface from coming in contact with the coals, and by so doing, prej serves the drum from lbeing burned or melted up by the intense heat of the furnace. In devices of this character, which permit the hot coals to substantially surround it, it is found that there is no metal which will withstand this terrible heat for any length of time, as there 1s nothing except the inner upward current of air to counteract the effect of the heat. But, by giving a substantially large area to the inner surface 13v and by keeping the outer surface out of contact with the coal, I find that I'cannot only preserve the entire. structure against the deteriorating effect of the fire, but also absorb sufficient heat to thoroughly and properly reheat the air4 coming up through the drum or` the oxidizing purposes. It may here be noted that although the back face of the drum is shown as being slightly less convex than the adjacent surface of the wall A, so as to form a small air space, it may have the same curvature so that its entire area will conltlact with and .be cooled directly by the wa In order to properly oxidize the gas, which is normally suspended over the bed of coals in the furnace, I ,find it necessary to4 heat the injected air to a temperature of approxi-- mately one-thousand degrees and in order to do this properly, and ei Fahrenheit,

ciently, and prevent a relativel cool and ineffective air supply from reac ing the gas, I provide the drum with a series of baffle plates 14, which are arranged in staggered relation, so as to zig-zag, slightly retard, and

a lengthen the upcoming air current, and these suspended spreader, or cap, 16, the periphery of which is perforated as at 17, so as to eject the heated air radially in all directions into the suspended gases. The pipe 15 1s provided with staggered vertical bafiles 18, which have the same function as, and are auxiliary to, the baffle plates 14. In the elbow connectingthe members 13 and 15 is a butterfly damper 20, adjusted by a lever 21 which is retained in adjusted positions by a rack 22. The object of this damper is to regulate,'retard, or entirely shut off the air supply when so desired.

It may here be noted that while the bracket 12 rigidly supports-the drum 10 within the furnace, the base 8 has a limited vertical movement within the member 11 so as to permit the base to reciprocate up and down when the furnace grate is being shaken.

It is understood that various modifications may be made in the general design and structural details of the invention as herein illustrated and described, providing, however, that such modifications come within the spirit and scope of the appended claims. Having now, therefore, fully shown and described my invention whatI claim tobe new and desire to protect by Letters Patent is 1. A gas burner for a furnace, comprising a drum, arranged within the furnace, adjacent to the wall thereof, and over the grate,

so as to be in contact with and subject to the heat of the fuel at one side and subject to the cooling action of the wall at the other side, a distributor arranged over the re bed in the furnace and communicating-with the drum to receive heated air therefrom, and discharge it over the fire bed, baffles arranged within the drum, and a damper above the bales for controlling the current of air tending from the upper end of the drum and inwardly over the fuel level, horizontal baffles in the drum, and vertical baffles in the tubular` member, said balles being arranged in staggered relations so as to lengthenthe Aair course and retard the air current through the drum'and tubular member.

4. The combination with a furnace, of a hollow air heating member rigidly secured A adjacent to the wall of the furnace and above the grate thereof, a distributor communicating with theeupper end of the member, and a base member resting on the grate and adjustably associated with the lower end of the air heating member.

5. The combination with afurnace having a grate, of a hollow base member resting on the grate, an air preheating member communicating with the base and slidably associated therewith, means for rigidly suspending the preheating member over the base, and a horizontal tubular member extending from the upper end of the preheating member and overthe fuel level of the furnace.

In testimony whereof I afiix my signature.

FREDERICK H. SCHIERENBECK. 

